Questions 17 ～ 20 are based on the following passage. You now have 20 seconds to read Questions 17 ～ 20.
Which of the following statements is TRUE according to what you have heard

A．Keith’s phrase book is smaller than any others.
B．Foreigners can’t understand phrases in books.
C．Phrase books provide people with right phrases.
D．A foreign language is not difficult to learn.